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Polyoxometallate organic-inorganic composite film with visible light photo-catalytic activity and preparation method and application thereof

A polyoxometalate, photocatalytic activity technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, organic compound/hydride/coordination complex catalyst, etc., can solve the price Expensive, high power consumption and other problems, to achieve effective absorption, high degradation, and improve the effect of photocatalytic efficiency

Inactive Publication Date: 2010-01-27
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide is limited by the excitation wavelength, and can only use less than 5% of the ultraviolet light in sunlight, and there are some limitations in the use of ultraviolet light, such as large power consumption and high price; while visible light with a wavelength of 400-750nm is 43% However, it cannot be used. Therefore, research and development of new photocatalytic materials and the use of sunlight to degrade pollutants in the environment will be of great significance to environmental protection and energy saving.
The film has not been reported as a photocatalytic material for the degradation of organic dyes, especially the use of thionine-sensitized heteropolyacids to degrade organic dyes using sunlight

Method used

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  • Polyoxometallate organic-inorganic composite film with visible light photo-catalytic activity and preparation method and application thereof
  • Polyoxometallate organic-inorganic composite film with visible light photo-catalytic activity and preparation method and application thereof
  • Polyoxometallate organic-inorganic composite film with visible light photo-catalytic activity and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: (PW 12 o 40 / TH) 10 Composite film preparation

[0013] First, clean the quartz wafer or ordinary glass or silicon wafer: place the substrate in 98% H 2 SO 4 with 30%H 2 o 2 (7:3 v / v) dipping treatment at 80°C for 40 minutes, take it out and wash it with distilled water; then immerse in H 2 O:H 2 o 2 : NH 3 =5:1:1 (v / v / v) dipping treatment at 80°C for 20 minutes, take it out, wash it with distilled water, and dry it with nitrogen to obtain a film-forming substrate for use.

[0014] Then perform PEI cationization on the substrate: immerse the substrate after the above-mentioned treatment procedure in 10 mg / mL polyethyleneimine PEI solution for 20 minutes, take it out, wash it with distilled water, and dry it with nitrogen.

[0015] Then the PEI cationized substrates were alternately immersed in 5mM PW 12 o 40 solution and 0.5mM TH solution, placed separately for 20min, each immersion step was taken out, washed with distilled water, and dried wit...

Embodiment 2

[0017] Embodiment 2: solar photocatalytic activity test of film

[0018] Photocatalytic experiment: Methyl orange (MO) was selected as the model organic dye molecule, and the molecular formula is as follows:

[0019]

[0020] Take 5ml MO (10mg / L) and put it into a quartz test tube, then put it into a quartz glass piece (size 25mm×12mm×1mm) (PW 12 o 40 / TH) 10 Self-assembled film, placed under the sun for solar light experiment, the solar radiation intensity is 4.2J / cm 2 .min, with an average temperature of 20°C.

[0021] Evaluation of photocatalytic activity: Put the film sample into 5ml of 10mg / L methyl orange solution, irradiate it under sunlight for a certain period of time, take out the film, and use the ultraviolet-visible spectrometer to measure the dye’s photocatalytic activity during the light process. The change of the absorption spectrum in the medium, and the light absorption value ε of the reaction solution at the maximum absorption wavelength is measured 1...

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Abstract

The invention relates to a polyoxometallate organic-inorganic composite film with visible light photo-catalytic activity and a preparation method and application thereof. The composite film consists of heteropoly acid anion PW12O40<3-> or SiW12O40<4-> and thionine, and is prepared by a layer-by-layer self-assembly method. The film has good photo-catalytic degradation property to methyl orange coloring matter molecules under the illumination of sunlight, and has potential application prospect in the aspects of environmental protection and energy conservation.

Description

technical field [0001] The invention relates to a photocatalyst made of polyoxometalate-thionine composite film, in particular to a polyoxometalate composite film catalyst with high catalytic activity in the visible light range. Background technique [0002] In the 21st century, environmental issues have become a worldwide issue. The development of new materials that consume less resources and energy, have little impact on the ecological environment, can be recycled, or have direct functions of repairing and purifying the environment has become an important way to solve the crisis of human survival. In my country, dye pollutants are one of the main sources of water pollution. The photocatalytic degradation technology developed in the 1980s provides a good solution for the purification of low-concentration, difficult-to-convert priority pollutants in water bodies. However, in the past 20 years of research, a lot of attention has been focused on the photocatalytic degradation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J23/30B01J27/188C02F1/30
Inventor 高水英曹荣
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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